Microfluidics: Small 19/2009

The cover picture shows fluorescence micrographs of 4-µm particles taken in optically coated mirror-embedded microchannels. At 45 degrees the mirror ideally reflects the side views of the channels and enables the positional information of microparticles in three dimensions to be easily obtained without any calibration by directly observing the in-focus side and top views. With this method, the principle of hydrophoresis that has spatially varying characteristics in three dimensions is revealed. For more information, please read the Full Paper “Optically Coated Mirror-Embedded Microchannel to Measure Hydrophoretic Particle Ordering in Three Dimensions” by S. Choi and J.-K. Park, beginning on page 2205.